Written by Harvard Medical School geneticist Dr. David Sinclair, Lifespan presents a radical narrative: aging is not an inevitable natural process, but a disease—and like any disease, it can be prevented, treated, and potentially reversed.  

Sinclair argues that humanity is focused on "whack-a-mole" medicine—treating individual age-related diseases like cancer, diabetes, and heart disease one by one. Instead, he asserts that we should target the root underlying cause of all these conditions: biological aging itself.